First observation of Λc(2595)+ → $$ {\Lambda}_c^{+}{\pi}^0{\pi}^0 $$ and Λc(2625)+ → $$ {\Lambda}_c^{+}{\pi}^0{\pi}^0 $$

A bstract By analysing e + e − annihilation data corresponding to an integrated luminosity of 368 . 48 pb − 1 collected at the centre-of-mass energies of $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 4 . 918 and 4 . 951 GeV with the BESIII detector, we report the first observation of Λ c (2595) + and Λ c (2625) + → $$ {\Lambda}_c^{+}{\pi}^0{\pi}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> with statistical significances of 7.9 σ and 11.8 σ , respectively. The branching fractions of Λ c (2595) + and Λ c (2625) + → $$ {\Lambda}_c^{+}{\pi}^0{\pi}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> are measured to be (59 . 5 ± 11 . 1 stat . ± 7 . 9 syst . )% and (41 . 0 ± 5 . 2 stat . ± 3 . 3 syst . )%, respectively. The absolute branching fraction of Λ c (2595) + is consistent with the expectation of the mechanism referred to as the threshold effect , proposed for the strong decays of Λ c (2595) + within uncertainty.

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Journal
Journal of High Energy Physics
Published
2025-08-08
DOI
https://doi.org/10.1007/jhep08(2025)065
Primary Topic
Particle physics theoretical and experimental studies
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article

First observation of Λc(2595)+ → $$ {\Lambda}_c^{+}{\pi}^0{\pi}^0 $$ and Λc(2625)+ → $$ {\Lambda}_c^{+}{\pi}^0{\pi}^0 $$

A. Dbeyssi, K. Goetzen, K. Y. Shan, X. Z. Li et al.
Journal of High Energy Physics
Particle physics theoretical and experimental studies
article

First observation of Λc(2595)+ → $$ {\Lambda}_c^{+}{\pi}^0{\pi}^0 $$ and Λc(2625)+ → $$ {\Lambda}_c^{+}{\pi}^0{\pi}^0 $$

A. Dbeyssi, K. Goetzen, K. Y. Shan, X. Z. Li, Y. H. Wu, Y. Nefedov, Y. C. Zhu, Z. F. Tian, L. X. Zhu, H. N. Li, S. Pacetti, J. Jackson, Z. C. Zhou, X. Y., G. B. Sun, Ch. Rosner, A. Amoroso, J. P. Wang, Yanhu Zhan, J. K. Jiao, C. X. Yu, X. S. Qin, X. T. Chen, X. T. Huang, T. Johansson, J. Dong, T. J. Zhu, Z. Y. Yuan, F. Z. Qi, J. W. Zhang, Y. Schelhaas, J. F. Chang, Y. Z., H. C. Zhang, Y. H. Fan, L. Liu, P. C. Hong, M. Kuessner, U. Wiedner, X. Liu, S. Marcello, Yang Gao, Yanlong Wang, M. Tang, X. R. Zheng, F. Cossio, V. Batozskaya, F. Hanisch, Z. L. Zhang, S. H. Zhang, Y. Z. Zhou, W. J. Zheng, Y. H. Zheng, M. Wolke, M. H. Li, S. L. Hu, X. Pan, X. S. Jiang, C. J. Xu, L. P. Zhou, S. Janchiv, A. Sarantsev, F. C., F. Li, L. Y. Tao, G. Wilkinson, G. Chelkov, Y. Q. Chen, T. Y. Li, K. J. Ren, Z. L. Wang, R. A. Briere, S. Spataro, X. M. Xian, W. D. Niu, W. M. Song, J. H. Zou, G. Li, L. J. Li, Q. M., L. G. Shao, P. C. Jiang, F. Yan, Shixuan Du, G. Zhao, Q. X. Li, P. Egorov, J. J. Zhang, Y. H. Meng, H. Y. Zhang, W. G. Li, T. Y. Xing, J. G. Lu, G. R. Liao, Z. D. Zhang, C. F. Qiao, F. A. Harris, W. K. Liu, Y. F. Lyu, Y. S. Huang, Z. Y. Wang, Y. Raghu Reddy, Zudi Lu, F. Weidner, S. Gramigna, Z. T. Sun, G. Chen, Z. P. Yao, S. Plura, Y. Y. Peng, S. S. Fang, Junhua Zhang, A. Q. Guo, R. Li, J. L. Zhang, J. Z. Zhang, XY Zhang, A. Gilman, J. G. Messchendorp, M. Rolo, Jialun Ping, S. Sosio, S. S. Jiang, J. Muskalla, H. Lu, M. Q. Jing, Y. T. Zhang, X. Y. Zhou, Y. T. Liang, W. Yan, L. Q. Huang, C. Herold, D. Dedovich, F. R. Zeng, H. X. Yang, J. Libby, G. Y. Xiao, H. Zhang, Z. D. Liu, I. Balossino, J. Zu, H. M. Liu, N. Yu. Muchnoi, X. J. Wang, T. Chen, K. L. Li, M. Maggiora, M. Qi, A. Calcaterra, Y. G. Li, A. Rivetti, B. X. Zhang, H. R. Qi, Y. Zhang, H. Q. Zhang, P. L. Liu, K. X. Huang, G. X. Sun, M. Fritsch, Y. M. Zhang, M. C. Du, M. L. Chen, J. X. Zhang, T. J. Wang, Lina Zhao, H. Y. Chen, J. X. Teng, X. M. Zhang, J. Yuan, D. M. Li, Z. Wang, A. A. Zafar, M. Lellmann, C. J. Tang, R. Aliberti, L. Wollenberg, G. Mezzadri, Z. H. Duan, T. Z. Song, M. Ye, W. X. Fang, Y. Guo, Z. H. Qin, Lu Fang, D. Y. Wang, H. H. Liu, D. H. Zhang, G. S. Huang, X. T. Hou, Yanan Song, X. Wang, Y. Q. Wang, Y. Pan, X. Zhong, Yunfei Bai, Y. N. Wang, M. N. Achasov, I. Mackay, A. Bortone, A. Khoukaz, H. Liu, N. Berger, E. Gersabeck, W. H. Tian, J. F. Hu, Y. M., X. Y. Zhang, Y. J. Sun, F. H. Liu, W. D. Li, X. N. Wang, Y. Zhang, G. Y. Zhang, D. Jiang, F. E. Maas, Zh. Zh. Zhang, Y. J. Mao, L. L. Wang, C. X. Yue, G. Y. Tang, H. K. Sun, Z. J. Li, X. Y. Li, S. Y. Xiao, H. H. Zhang, J. R. Luo, V. Prasad, Z. H. Lei, Z. Z. Zhang, L. C. Liu, Y. K. Heng, L. Fava, X. R. Chen, H. J. Wang, J. S. Li, Gang Yu, Jianying Zhou, Lei Zhu, C. H. Heinz, Z. Y. Deng, I. Denysenko, L. M. Zhang, J. R. Li, T. Luo, W. D. Zhu, M. Ablikim, V. Thoren, F. Stieler, J. H. Feng, L. J. Wu, T. T. Lei, Tao Yu, P. Adlarson, G. M. Liu, R. Farinelli, C. Chen, R. Kiuchi, A. N. Zhu, X. Y. Shan, J. Q. Zhang, J. H. Yang, X. P. 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Brueggemann, M. H. Liu, X. Li, Jiaxing Zhao, A. Limphirat, Feng Liu, C. Wu, Y. F. Wang, H. L., R. Q., Y. R. Wen, S. J. Chen, J. F. Shangguan, Z. H. Qu, Yilin Wang, B. X. Liu, H. Miao, S. H. Zeng, Q. T. Tao, H. B. Liu, Z. J. Chen, H. B. Li, Hui Li, Ke Liu, M. Y. Dong, M. J. Guo, C. X. Lin, X. H. Li, K. Liu, A. Q. Zhang, Shuheng Ruan, Xubo Gao, G. Y. Hou, W. H. Shen, J. B. Liu, M. M., W. Shan, S. L. Olsen, X. Shi, R. Y. Zhang, J. Zhang, L. Y. Dong, Lei Li, N. in der Wiesche, B. Moses, F. Hölzken, O. Afedulidis, X. L. Wang, Z. A. Liu, Q. Liu, C. F. Xu, X. B. Ji, A. Pathak, X. Zeng, X. H. Xie, Y. Tian, Yaqian Wang, S. M. Chen, E. Bianco, Z. W. Yang, Y. P. Liao, B. Ding, Jinyu Liu, T. Yang, Yan Liu, Cheng Li, Y. Lin, Lu Liu, Feng Liu, Ting Liu, X. R. Lyu, M. Shao, R. P. Zhao, Jianyu Zhang, Y. Fu, Hongrui Zhang, Cai Liu, Yue Wu, Cheng Li, K. S. Zhu, Jianjian Wang, Yi Wang, Lei Zhang, Jingjing Song, B. Zheng, Z. Wu, A. Guskov, Lianjie Wu, T. Holtmann, Huihui Liu, Junhao Yin, N. Cao, Y. Q. Fang, Yan Wan, X. Cai, Y. G. Xie, K. S. Zhu, Yanqing Niu, T. Sun, Hao Xiao, Y. Ding, S. Y. Shi, K. L. Han, Gaofeng Fan, X. Y. Chai, L. S. Nie, Y. Hu, Tao Hu, J. P. Zheng, J. J. Fan, C. Chen, Zequn Sun, J. Zhao, Z. J. Shang, Wei Zhu, K. Sun, X. D. Yu, Q. P. Hu, C. Y. Guan, B. Y. Hu, B. H. Xiang, Y. A. Tang, Y. J. Su, R. J. Yang, X. S. Kang, H. C. Shi, Hui Sun, X. Q. Yan, Y. Y. Duan, W. L. Xu, J. Zhu, Y. B. Zhao, Y. C. Xu, Zhe Xu, Chao Chen, Yiling Xie, S. Su, L. Y. Qin, B. Kopf, S. J. Wang, Y. H. Xie, K. J. Zhu, Z. A. Zhu, J. F. Sun, H. S. Chen, X. Wu, H. Zhou, M. Greco, R. G. Ping, X. H. Wu, Z. P. Mao, W. Kühn, Q. N. Xu, L. Q. Qin, J. Fang, G. F. Xu, M. C. Yu, G. F. Cao, I. Uman, Z. J. Xiao, J. P. Dai, S. Nisar, L. K. Li, S. A. Cetin, S. J. Zhao, Q. J. Xu, J. J. Cui, X. L. Luo, Y. X. Zhao, H. Hu, T. Hussain, K. Schoenning, S. Zhou, Z. Y. You, Shulei Zhang, J. S. Yu, Z. G. Zhao, J. Zhang, A. Kupsc, M. Bertani, G. Felici, Y. Li, S.-K. Choi, Y. N. Gao, J. S. Zhang, R. E. Mitchell, T. 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Jiao, Z. X. Meng, X. L. Ji, Y. Zeng, Y. P. Pei, J. L. Fu, Q. P. Ji, J. Gutierrez, H. Liang, Y. Ban, S. L. Chen, Y. F. Yang, L. Sun, Z. W. Ge, W. X. Gong, H. -R. Bao, I. B. Nikolaev, H. J. Yang, Y. Huang, J. F. Wu, H. Gao, X. K. Zhou, Q. Ouyang, C. Liang, Yu Xu, Ying Yue, Qian Zhang, Yifan Yang, Y. Yuan, X. Jia
article en

Abstract

A bstract By analysing e + e − annihilation data corresponding to an integrated luminosity of 368 . 48 pb − 1 collected at the centre-of-mass energies of $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 4 . 918 and 4 . 951 GeV with the BESIII detector, we report the first observation of Λ c (2595) + and Λ c (2625) + → $$ {\Lambda}_c^{+}{\pi}^0{\pi}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> with statistical significances of 7.9 σ and 11.8 σ , respectively. The branching fractions of Λ c (2595) + and Λ c (2625) + → $$ {\Lambda}_c^{+}{\pi}^0{\pi}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> are measured to be (59 . 5 ± 11 . 1 stat . ± 7 . 9 syst . )% and (41 . 0 ± 5 . 2 stat . ± 3 . 3 syst . )%, respectively. The absolute branching fraction of Λ c (2595) + is consistent with the expectation of the mechanism referred to as the threshold effect , proposed for the strong decays of Λ c (2595) + within uncertainty.

Journal of High Energy PhysicsVol. 2025(8)
Goethe University Frankfurt (DE), University of Science and Technology Liaoning (CN), Liaoning University (CN), Università degli Studi del Piemonte Orientale “Amedeo Avogadro” (IT), Uppsala University (SE), University of Science and Technology of China (CN), University of Hawaii System (US), Institute of Business Administration Karachi (PK), Central South University (CN), Guangxi University (CN), Nanjing Normal University (CN), Liaoning Normal University (CN), North China Electric Power University (CN), Moscow Institute of Physics and Technology (RU), Shandong University (CN), Sun Yat-sen University (CN), COMSATS University Islamabad (PK), Hangzhou Normal University (CN), Hunan University (CN), Henan University of Science and Technology (CN), University of Groningen (NL), GSI Helmholtz Centre for Heavy Ion Research (DE), University of the Punjab (PK), Hunan Normal University (CN), Henan University (CN), Shanxi University (CN), Shanghai Jiao Tong University (CN), Yantai University (CN), University of Tarapacá (CL), South China Normal University (CN), Novosibirsk State University (RU), Yunnan University (CN), Jilin University (CN), Johannes Gutenberg University Mainz (DE), Justus-Liebig-Universität Gießen (DE), University of Ferrara (IT), Qufu Normal University (CN), Peking University (CN), Nankai University (CN), University of Münster (DE), Sichuan University (CN), Indian Institute of Technology Madras (IN), Fudan University (CN), Inner Mongolia University (CN), University of Perugia (IT), Kurchatov Institute (RU), Shandong Normal University (CN), University of Manchester (GB), Guangxi Normal University (CN), China University of Geosciences (CN), Huangshan University (CN), Joint Institute for Nuclear Research (RU), University of Jinan (CN), Henan University of Technology (CN), University of Bristol (GB), Wuhan University (CN), Zhengzhou University (CN), Soochow University (CN), University of Oxford (GB), Central China Normal University (CN), National Centre for Nuclear Research (PL), Institute of Physics and Technology (MN), Institute of Particle Physics (CA), Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT), Helmholtz Institute Mainz (DE), Indiana University Bloomington (US), Istinye University (TR), Siberian Branch of the Russian Academy of Sciences (RU), Institute of Modern Physics (CN), Institute of Nuclear and Particle Physics (GR), Jilin Medical University (CN), Institute of High Energy Physics (CN), Shanxi University of Traditional Chinese Medicine (CN), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Piedmont University (US), Bristol Robotics Laboratory (GB), Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (IT), University of Chinese Academy of Sciences (CN), Hebei University (CN), Budker Institute of Nuclear Physics (RU), École Polytechnique Fédérale de Lausanne (CH), China Center of Advanced Science and Technology (CN), University of Turin (IT), Indiana University (US), Chung-Ang University (KR), Near East University (CY), Carnegie Mellon University (US), Henan Normal University (CN), Zhejiang University (CN), Lanzhou University (CN), Southeast University (CN), Renmin University of China (CN), Suranaree University of Technology (TH), Beihang University (CN), Nanjing University (CN), Ruhr University Bochum (DE), University of South China (CN), Shanxi Normal University (CN), Tsinghua University (CN)
U.S. Department of Energy, University of the Punjab, Yantai University, Strong, University of Oxford, National Research Foundation, Deutsche Forschungsgemeinschaft, Rijksuniversiteit Groningen, Swedish Foundation for International Cooperation in Research and Higher Education, National Natural Science Foundation of China, Chinese Academy of Sciences, National Research Foundation of Korea, University of Jinan, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Zhengzhou University, University of Science and Technology Liaoning, Zhejiang University, Università degli Studi del Piemonte Orientale, Università degli Studi di Torino, Wuhan University, Uppsala Universitet, Yunnan University, University of South China, University of Science and Technology of China, Istituto Nazionale di Fisica Nucleare, CAS Center for Excellence in Particle Physics, Shanghai Key Laboratory for Particle Physics and Cosmology, Institute of High Energy Physics
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